Australian Daniel Ricciardo says he is still struggling to move on from the disappointment of losing last weekend's Spanish Grand Prix, won by his 18-year-old Dutch teammate Max Verstappen.

"I think the outcome of the race was frustrating," the Red Bull driver said in a video interview conducted by the Formula One team ahead of next week's Monaco Grand Prix, a favourite that he has yet to win.

"Is it easy to move on? I wouldn't say easy. Can you move on? Absolutely.

"But yeah, it's been a few days since the race and I still wake up with it on my mind. I am going to bed with it off my mind but I'm waking up with it on my mind. It will take a bit of time," he added.

Verstappen stars in first race for Red Bull

Verstappen was making his debut for the former champions after moving up from Red Bull-owned Toro Rosso in a swap with Russian Daniil Kvyat.

Ricciardo felt his results in the last three races had been less than he deserved, with the Australian leading nearly half of the Spanish Grand Prix before strategy and a late puncture dumped him down to fourth.